Eolianite-Paleosol-Sequences in Fuerteventura and Central Spain -Stadial-Interstadial shifts and climatic differences

DFG已经资助的关于富尔特文图拉沙丘-古土壤层序和西班牙中部黄土-古土壤层序的两个项目为理解这两个系统提供了基本知识。富尔特文图拉的沙丘-古土壤序列似乎提供了关于最后一次冰期-间冰期旋回的详细信息。在西班牙中部，我们首次发现了具有超过8米厚的古土壤夹层的强大黄土序列，并对其进行了采样和分析。初步结果表明，这些黄土-古土壤序列是在末次冰期形成的，详细的年代尚不清楚。其中一个目标是提供过去150 ka的高分辨率年代学。在富尔特文图拉，我们的结果表明，沙丘-古土壤序列也在最后一次冰川期间形成，但到达的时间更早。因此，我们认为这两个环境都有很好的潜力来更详细地清理，并首次在最后一次冰川期间的古环境和古气候方面发生稳定的间歇变化。更精确的时间分辨率是这个项目的一大挑战，因为我们倾向于测试新的发光方法，以在更老的时间片中到达，特别是在Fuerteventura。西班牙中部黄土沉积物中的夸克颗粒提供了良好的发光行为，这将有助于提高年代学精度。在这个项目中，我们的目标是重建末次冰期稳定期和间歇期的古环境和气候变化，特别强调高年代学分辨率。这两种环境的比较将有助于理解上一次冰川时期从西班牙中部到加那利群岛的气候梯度。我们的初步结果表明，在最后一次冰川期间，富尔特文图拉经历了更潮湿的条件，而西班牙中部似乎在同一时间经历了更干旱的条件。对比这两种环境在稳定期和间歇期的古环境和气候变化，将扩大我们对有关气候参数及其地貌动力效应的认识。

Two already by DFG funded projects about dune-paleosol-sequences in Fuerteventura and about Loess-Paleosol-sequences in Central Spain provided basic knowledge for the understanding of both systems. Dune-paleosol-sequences of Fuerteventura seem to deliver detailed information concerning the last glacial-interglacial-cycle. In Central Spain we detected for the first time mighty loess sequences with intercalated paleosols of more than 8 meters that are sampled and analyzed. Preliminary results show that these loess-paleosol-sequences have been formed during the last glacial and that detailed datings are still missing. One aim is to deliver a high resolution chronology over the last 150 ka. In Fuerteventura our results show that dune-paleosol sequences have been formed as well during the last glacial, however reaching more back in time. Therefore we see a good potential for both settings to clear up in more detail and for the first time stadial-interstadial shifts during the last glacial in terms of paleoenvironment and paleoclimate. A more precise chronological resolution is one big challenge of this project as we tend to test new luminescence approaches for reaching in older time slices especially in Fuerteventura. Quarz grains of the loess sediment in Central Spain provide good luminescence behavior that will help to improve the chronological precision. In this project we aim to reconstruct paleoenvironmental and climate change during stadial and interstadial times of the last glacial with special emphasize on high chronological resolution. The comparison of both settings will help to understand climatic gradients from Central Spain to the Canary Islands during the last glacial. Our preliminary results suggest that during the last glacial Fuerteventura underwent more humid conditions whereas Central Spain seems to have passed more arid conditions at the same time. The comparison of both settings in terms of paleoenvironmental and climate change during stadial and interstadial phases will widen our knowledge about relevant climatic parameters and their morphodynamic effects.